Paper-bag machine.



2 SHEETS-SHEET l.

PATENTED JAN 21, 1908 IMF/nm Wil/Lam .Lore

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iNo. 877,205. l l PATBNTBD JAN. 21.1908.

- W. A. LORENZ.

' PAPER BAG MAGHINE.

APPLIATION FILED JAN. 26, 1905.

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UNITED sTATEs PATENT oEEIoE.

WILLIAM A. LORENZ, lOF HARTFORD, CONNECTICUT, ASSIGNOR TO UNION PAPER BAG MACHINE COMPANY, OF PHILADELPHIA, PENNSYLVANIA, A CORPORATION OF PENN- SYLVANIA.

- PAPER-BAG MACHINE To all whom it may concern:

Beit known that I, WILLIAM A. LORENZ, a citizen of the United States, and resident of Hartford, in the county of Hartford and State of Connecticut, have invented certain new and useful Improvements in Paper-Bag Machines, of which. the following is a full, clear, and exact specification.

This invention relates to paper bag machines of the class which form square bottom bags from bellows-sided tubes or blanks; and it has to do particularly with what is well known as the diamond forming operation.

The invention herein shown is a modification of the invention described in my Patent No. 847,191 dated March 12, 1907. The machine therein described employs an oscillatory folding plate provided with a dening edge over which one of the plies of the blank is vfolded to form the diamond while the l Jlank is held on a suitable carrier. The folding plate is mounted so that it is near to the I. the

adjacent surface of the carrier at the initial movement of the oscillation, the aXis of oscillation beingalso in close proximity to the surface of the carrier, though at some distance from the deiining edge. permit the defining edge to clear the adjacent surface of thecarrier during the oscillations of the folding plate, this adjacent portion of the surface of the carrier is not integral wi th vthe rest of the surface, but is pivoted thereto at its forward end and is provided with means for swinging it on this ivot away from the folding plate, thus securing the necessary clearance, the surface of the swinging ortion being iiattened for a distance back rom the diamond holder in order to relieve ply of the blan i between the diamond holder and the tuck hold ers during they-early part of the diamond forming operation and thus al-v low the paper to assume the shape into which this operation naturally carries it.

Figure 1 is a sectional side view of as much of the mechanism as is necessary to show the present invention, the section being taken Specification of Letters Patent.

1' Y Application filed January 26| 1905. Serial Nou 2421766.

In ord er to' a er of the undue strain to which it,

Patented Jan. 21, 190s.

through the machine at one side of the carrier.- Fig. 2 is a fragmentary side view on a slightly enlarged scale, and shows'the swinging surface in its inner position. Fig. 3 is a partial front view of Fig. 2. Fig. 4 is a view similar to Fig. 2 but with the swinging surface in its outward position. Fig. 5 is a partial front view of Fig. v4.

The general construction of the machine herein shown is similar to that described in my patent above referred to, to which reference may be made for such details as are not oted on a stud 58 appurtenant to the. upright 12. It is the function of the guide plate 57 to hold the front end of the blank down as it passes forward from the rolls and prevents its colliding with the folding plate 40 in the return movement of the latter. The bracket 37 has an arm 59 which is rovided withV a cam roll 60 which is held y a spring 62 against thev cam 61, the latter being secured to the lower roll shaft 15.

The oscillating defining plate 4() is disposed adjacent to the carrier 23 in such a position that the blank B will pass beneath it from the undersidel of the guide plate 57. The defining plate 4() is provided with box holders 42 and` is secured at its inner end to the trunnioned bracket 41 while theouter end is arranged to slide endwise on another trunnioned bracket 56. The oscillating movement of the defining plate 4() and its advancing movement as well as the operation of the box holders 42 is or may be effected by means of mechanism like that shown and described in my aforesaid patent, which also shows and describes the construction and operation of the drop plate 72 together with the driving rolls 77, deflecting plate 7 9 and delivery rolls 8O and 81.

The rotating carrier 2S which holds and sustains the blank B during the diamond forming operation is'secured to the shaft 24 journaled in bearings in the side frames 12. The carrier 23 is provided with two sets of blank holding devices which hold the lower ply of the blank in position while the upper ply is being turned back, and which operate alternately on the blanks. Each set includes a diamond holder 32 which is pivoted on a stud 33 (Fig. 2) appurtenant to the carrier 23 and has an arm 33 provided with a roll 34 held in engagement with a fixed cam 35, by means of a spring 36, so that it grips a roll 83 mounted on an extension 9]. on its under side, which roll is held in engagement with a fixed cam 39 b y means of a spring 90 (Fig. 4) thus causing the support 86 to swing towards and' from the center of the carrier 23-as the latter rotates. The tuck holders 27 are disposed on opposite sides of the swinging support 36 in position to grip the lower edges of the tuck to the support and are operated by means substantially like those shown in the above mentionedpatent.

ln this machine, as in the machine of the aforesaid patent, the movement of the swinging support towards the center' of the carrier 23 enables the defining edge 39 to pass clear of the support during the oscillation of the plate 40, as shown in Fig. But in this machine the support 36 being thus pivoted at its rear end, its movement toward the center of the carrier withdraws from those portions of the blank between the diamond holder and the tuck holders, and leaves the blank unsupported between these places. It also carries the tuck holders downward and with them the adjacent portions of the blank, so that the paper is relieved ofthe strain to which its front end would be subjected were it held closely to thel surface of the support S6 during the folding back of the upper ply. The tendency of the paper to tear or wrinkle or to otherwise fold imperfectly during this operation is thus largely overcome. At the same time the front end of the blank is still held by the diamond holder 32 in its original position on the surface of the carrier 23. i

lt is not essential that the diamond holder The rear part of the support 86 need not be.

concentric with the surface of the carrier 23, as it may be iiattened or otherwise cut away at that place. Nor is it essential that the cooperating devices for folding the diamond on the blank support shall be precisely as shown. Gther cooperating devices may be employed without departing from the spirit of this invention.

The consecutive operation Yof the machine is as follows The blank B properly formed and out to length is fed between the rolls 13 and 14 whicl'lfcarry it forward beneath the guide plate 57, andthe definingplate 40, in which position the forward end is gripped to the carrier 23 by the diamond holder 32. The box holders 42 and the tuck holders 27 now enter the tucks on both sides and grip the upper and lower plies of the blank to the defining plate 40 and the swinging support 86. As the blank moves for ward with the carrier 23, the folding plate A40 swings on its axis and folds back the upper ply, while the support 36 swings downward to permit the defining edge 3Q to pass clear of it. This latter' movement carries the tuck holders 27 downward while the end of the diamond holder 32 still retains the end of the blank in its original position on the carrier 23, as shown in Figs. 2

and As the carrier 23 continues its forward movement, the defining plate 40 folds the upper ply still further over, and the swinging support 36 returns to its original position, thus bringing the parts to the position shown in Figs. 4 and 5, the folds of the blank being flattened down to place by the drop plate 7 2 which has in the mean time swung forward. The diamond holder 32 now releases its hold and the blank is carried from the carrier 23 by the driving rolls 77 and the defiecting plates 79 to the delivery rolls S0 and 81 from whence it passes on to any suitable pasting and flap folding mechanism.

Some of the features herein shown are shown, described and claimed in my aforesaid patent 847,191. r ln so far as this application. shows features which are also shown and described in the said patent it is to be regarded as being subordinate to said patent.

ln my prior patents numbers 340,073, 847,191, 847,193 and 347,195 lhaveshown, described and claimed more or less broadly various mechanisms for holding and folding a paper bag blank in ways in -which the front end of the lower ply is supported in a raised position relative to the plane in which the triangular folds are formed, the object being, as in the present clase, to relieve the front end of the paper from strain during the formation of those folds. In so far as it may be considered that the present application shows features of construction, or arrangement in common with the said prior patents, it is to be regarded as being subordinate to these patents.

I claim as my invention 1. ln a paper bag machine, means for forming diamond folds on bellows sided 'diamond fold,. and means for moving the I0 blank support relative to the diamond holder, during the diamond forming operation.

2. In a paper bag machine, mechanism -for forming diamond folds on bellows sided blanks, having in combination a rotating blank carrier, a diamond holder mounted on the blank carrier for holding the front end of the blank relative to the carrier, a blank support pivotally mounted. upon the carrier for oscillation toward and away from the dia` mond holder, and having tuck holders for engaging the lower tucks of the blank, means for turning back the upper ply to form the diamond fold., and means for oscillating the blank support relative to the diamond holder during the diamond. forming operation.

3. In a paper bag machine, mechanism for forming diamond folds on bellows sided blanks, having in combination a rotating blank carrier, a diamond holder for holding the front end of the diamond relative to the carrier, a blank support pivoted to the oarrier on an axleremote from the diamond holder, tuck holders mounted upon the blank support between the said axis and the diamond holder, means for turning back the upper ply of the blank to form the `diamond folds, and means for oscillating the blank support relative to the diamond holder during the diamond forming operation.

4. In a paper bag machine, mechanism for forming diamond folds on bellows sided blanks, having in combination a rotating blank carrier, a diamond holder for holdingV the front end of the diamond relative to the carrier, a blank support pivoted at its rearward Aend to the blank carrier, with its free swinging end` extending forwardly toward the diamond holder, tuck holders mounted on the blank support between the axis thereof and the diamond holder, means for turning back the upper ply of the blank to form the diamond fold, and means for swinging the free end of the blank support away from and toward the diamond holder during the diamond forming operation.

5. In a paper bag machine, mechanism for forming diamond folds on bellows Isided blanks, having in combination a rotating blank carrier, a diamond holder for holding the front end of the-diamond relative to the carrier, a blank support pivoted at its rearward. end to the carrier, with its forward end extending toward the diamond holder, a def iining plate mounted for oscillation in a curved path above the rotary path of the bed, provided with means for turning back the upper ply of the blank vto form the diamond fold, and means for swinging the forwardly extending free end of the blank support .away from and toward the diamond holder during the diamond forming operation.

6. In a paper bag machine, mechanism for forming diamond, folds lon bellows sided blanks, having in combination a rotary blank carrier7 a diamond holder for holding4 the front end of the diamond relative to the carrier7 a blank support having its rearward end pivotally mounted upon the blank carrier upon an axis remote from the diamond, holder, with its free end extending forwardly toward the diamond holder, a defining plate mounted for oscillation in a curved path above the rotary path of the bed, and. provided with means for engaging and turning back the upper ply of the blank to form the ldiamond fold, means for oscillating the defining plate, and. means for swinging the forwardly extending eno of the blank support away from and toward the diamond holder, during the diamond forming operation.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

WILLIAM A. LORENZ.

Witnesses:

JAS. W. GREEN, WM. H. HoNI'ss.

Correction in Letters Patent No. 877,2W.

It is hereby certified that in Letters Patent No. 877,205, granted January 21, 1908,

t upon the application of William A. Lorenz, of Hartford, Connecticut, for an improvel ment in Paper-Bag Machines, an error appears in the printed specification requiring correction, as follows: In line 32, page 3, the Word axle should read axis; and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the ca se in the Patent Oioe.

Signed and sealed this 11th day of February, A. D., 1908,

[SEAL] C, C. BILLINGS,

Acting Commissioner of Patents. 

